| Oregon City to Popovo | 6,016.51 mi (9,682.63 km) |
| Oregon City to Provadia | 6,048.87 mi (9,734.72 km) |
| Oregon City to Radnevo | 6,078.47 mi (9,782.35 km) |
| Oregon City to Radomir | 6,004.27 mi (9,662.93 km) |
| Oregon City to Rakitovo | 6,063.02 mi (9,757.48 km) |
| Oregon City to Rakovski | 6,060.80 mi (9,753.91 km) |
| Oregon City to Razgrad | 6,009.86 mi (9,671.94 km) |
| Oregon City to Razlog | 6,057.03 mi (9,747.85 km) |
| Oregon City to Ruse | 5,980.97 mi (9,625.44 km) |
| Oregon City to Samokov | 6,029.98 mi (9,704.31 km) |
| Oregon City to Sandanski | 6,073.31 mi (9,774.05 km) |
| Oregon City to Sevlievo | 6,016.44 mi (9,682.53 km) |
| Oregon City to Shumen | 6,033.50 mi (9,709.97 km) |
| Oregon City to Silistra | 5,985.44 mi (9,632.64 km) |
| Oregon City to Sliven | 6,061.26 mi (9,754.65 km) |
